RF remote control transmitter & receiver model of 0020034 (S4C-DC09/12/24 & C-4) includes one 4-button remote transmitter and one 4-channel receiver. Each remote button controls each channel of receiver on and off. It can be used to control at most 4 same or different on / off electrical devices. Remote distance up to 100m. It is widely applied for remote controlling on / off electrical devices such as lights, fans, electric door locks, etc.